New Surface Temperature analysis for North America shows a doubling due to NOAA station siting problems and post measurement adjustments.

                     A new paper just released on 29 July  titled  " An area and distance weighted analysis of the impacts of station exposure on the US Historical Climatology Network temperatures and temperature trends" is co-authored by Anthony Watts of California, Evan Jones of New York, Stephen McIntyre of Toronto, Canada and Dr John R Christy former lead author of the IPCC and now from Department of Atmospheric Science, University of Alabama Huntsville.   It is a reanalysis of US surface station temperatures and has been performed using the recently WMO(World Meteorlogical Organisation) approved Siting Classifaction System devised by METEO.   The new analysis demonstrates that reported 1979-2008 US temperature trends are spuriously doubled,with a massive 92 percent of that over-estimation resulting from erroneous NOAA(National Oceanic and Atmospheric Administration US) adjustments of well sited stations upward.  The issue of station siting quality is expected to be an issue with respect to the monitoring of land surface temperature throughout the Global Historical Climate Network.  The Watts team of 2012 has employed a new methodology for station siting, pioneered by Michel Leroy of METEO France in 2010 and endorsed by the World Meteorological Organisation Commission for Instruments and Methods of Observation(CIMO-XV, 2010) fifteenth session , in September 2010 as a WMO-ISO standard ,making it suitable for reevaluating previous studies on the issue of station siting.  The Watts team found that well sited rural stations show a warming nearly three times greater after NOAA adjustment is applied!!  They found that poorly sited station trends are adjusted sharply upward, well sited stations are adjusted upward to match the already adjusted poor stations.  (see the Watts blog http://wattsupwiththat.com)